Unified receiver for multi-user detection

Abstract

In a user equipment, a unified receiver structure may be specified as both an equalizer and a multi-user detector. That is, the receiver may transfer between an equalizer and a multi-user detector within the same structure. A received signal may be estimated using the combined equalizer and multi-user detector unit.

1 . A method of wireless communication, comprising:
 receiving a signal at a receiver;   estimating the received signal via a common receiver unit comprising a channel equalizer and a multi-user detector (MUD).   
     
     
         2 . The method of  claim 1 , in which the MUD is based at least in part on a channel impulse response, scrambling code, and an orthogonal code of the signal. 
     
     
         3 . The method of  claim 1 , in which:
 estimating the received signal via the MUD comprises applying a time varying linear filter to a sample of the received signal   estimating the received signal via the channel equalizer comprises applying a time invariant linear filter to the sample of the received signal; and   estimating the received signal comprises concatenating the received signal via a de-spread and descramble unit.   
     
     
         4 . The method of  claim 1 , in which a complexity of the MUD is not affected by a number of active orthogonal codes of the signal. 
     
     
         5 . The method of  claim 1 , in which the MUD processes multiple cell signals with a plurality of spreading factors. 
     
     
         6 . The method of  claim 1 , in which the MUD processes multiple cell signals in a plurality of modes; at least one of the plurality of modes using an orthogonal code and/or scrambling code information; and at least another one of the plurality of modes not using the orthogonal code and/or scrambling code information. 
     
     
         7 . An apparatus for wireless communication, comprising:
 means for receiving a signal at a receiver;   means for estimating the received signal via a common receiver unit comprising a channel equalizer and a multi-user detector (MUD).   
     
     
         8 . The apparatus of  claim 7 , in which the MUD is based at least in part on a channel impulse response, scrambling code, and an orthogonal code of the signal. 
     
     
         9 . The apparatus of  claim 7 , in which:
 the means for estimating the received signal via the MUD comprises means for applying a time varying linear filter to a sample of the received signal   the means for estimating the received signal via the channel equalizer comprises means for applying a time invariant linear filter to the sample of the received signal; and   the means for estimating the received signal comprises means for concatenating the received signal.   
     
     
         10 . The apparatus of  claim 7 , in which a complexity of the MUD is not affected by a number of active orthogonal codes of the signal. 
     
     
         11 . The apparatus of  claim 7 , in which the MUD processes multiple cell signals with a plurality of spreading factors. 
     
     
         12 . The apparatus of  claim 7 , in which the MUD processes multiple cell signals in a plurality of modes; at least one of the plurality of modes using an orthogonal code and/or scrambling code information; and at least another one of the plurality of modes not using the orthogonal code and/or scrambling code information. 
     
     
         13 . A computer program product for wireless communication in a wireless network, comprising:
 a non-transitory computer-readable medium having non-transitory program code recorded thereon, the program code comprising:
 program code to receive a signal at a receiver; 
 program code to estimate the received signal via a common receiver unit comprising a channel equalizer and a multi-user detector (MUD). 
   
     
     
         14 . The computer program product of  claim 13 , in which the MUD is based at least in part on a channel impulse response, scrambling code, and an orthogonal code of the signal. 
     
     
         15 . The computer program product of  claim 13 , in which the program code to estimate the received signal further comprises:
 program code to apply a time varying linear filter to a sample of the received signal when using the MUD;   program code to apply a time invariant linear filter to the sample of the received signal when using the channel estimator; and   program code to concatenate the received signal via a de-spread and descramble unit.   
     
     
         16 . The computer program product of  claim 13 , in which a complexity of the MUD is not affected by a number of active orthogonal codes of the signal. 
     
     
         17 . The computer program product of  claim 13 , in which the MUD processes multiple cell signals with a plurality of spreading factors. 
     
     
         18 . The computer program product of  claim 13 , in which the MUD processes multiple cell signals in a plurality of modes; at least one of the plurality of modes using an orthogonal code and/or scrambling code information; and at least another one of the plurality of modes not using the orthogonal code and/or scrambling code information. 
     
     
         19 . An apparatus for wireless communication, comprising:
 a memory; and   at least one processor coupled to the memory, the at least one processor being configured:
 to receive a signal at a receiver; 
 to estimate the received signal via a common receiver unit comprising a channel equalizer and a multi-user detector (MUD). 
   
     
     
         20 . The apparatus of  claim 19 , in which the MUD is based at least in part on a channel impulse response, scrambling code, and an orthogonal code of the signal. 
     
     
         21 . The apparatus of  claim 19 , the at least one processor is further configured to
 to apply a time varying linear filter to a sample of the received signal when using the MUD;   to apply a time invariant linear filter to the sample of the received signal when using the channel estimator; and   to concatenate the received signal via a de-spread and descramble unit.   
     
     
         22 . The apparatus of  claim 19 , in which a complexity of the MUD is not affected by a number of active orthogonal codes of the signal. 
     
     
         23 . The apparatus of  claim 19 , in which the MUD processes multiple cell signals with a plurality of spreading factors. 
     
     
         24 . The apparatus of  claim 19 , in which the MUD processes multiple cell signals in a plurality of modes; at least one of the plurality of modes using an orthogonal code and/or scrambling code information; and at least another one of the plurality of modes not using the orthogonal code and/or scrambling code information.